ASTM A227 Spring Steel vs. Nickel 690
ASTM A227 spring steel belongs to the iron alloys classification, while nickel 690 belongs to the nickel alloys. There are 30 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.
For each property being compared, the top bar is ASTM A227 spring steel and the bottom bar is nickel 690.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 500 to 640 | |
| 90 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 200 |
| Elongation at Break, % | 12 | |
| 3.4 to 34 |
| Fatigue Strength, MPa | 900 to 1160 | |
| 180 to 300 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 72 | |
| 79 |
| Shear Strength, MPa | 1030 to 1330 | |
| 420 to 570 |
| Tensile Strength: Ultimate (UTS), MPa | 1720 to 2220 | |
| 640 to 990 |
| Tensile Strength: Yield (Proof), MPa | 1430 to 1850 | |
| 250 to 760 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 320 |
| Maximum Temperature: Mechanical, °C | 400 | |
| 1010 |
| Melting Completion (Liquidus), °C | 1450 | |
| 1380 |
| Melting Onset (Solidus), °C | 1410 | |
| 1340 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 52 | |
| 14 |
| Thermal Expansion, µm/m-K | 12 | |
| 14 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.2 | |
| 1.5 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.3 | |
| 1.6 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 1.8 | |
| 50 |
| Density, g/cm3 | 7.8 | |
| 8.3 |
| Embodied Carbon, kg CO2/kg material | 1.4 | |
| 8.2 |
| Embodied Energy, MJ/kg | 19 | |
| 120 |
| Embodied Water, L/kg | 46 | |
| 290 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 200 to 260 | |
| 31 to 170 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 61 to 79 | |
| 21 to 33 |
| Strength to Weight: Bending, points | 41 to 48 | |
| 20 to 27 |
| Thermal Diffusivity, mm2/s | 14 | |
| 3.5 |
| Thermal Shock Resistance, points | 55 to 71 | |
| 16 to 25 |
Alloy Composition
| Carbon (C), % | 0.45 to 0.85 | |
| 0 to 0.050 |
| Chromium (Cr), % | 0 | |
| 27 to 31 |
| Copper (Cu), % | 0 | |
| 0 to 0.5 |
| Iron (Fe), % | 97.4 to 99.1 | |
| 7.0 to 11 |
| Manganese (Mn), % | 0.3 to 1.3 | |
| 0 to 0.5 |
| Nickel (Ni), % | 0 | |
| 58 to 66 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 to 0.050 | |
| 0 to 0.015 |